B2346 – OBD-II DTC

OBD-II DTC B2346 – Mirror Switch Reference Voltage Positive Common Open Circuit

DTC B2346 meaning

DTC B2346 refers to a diagnostic trouble code indicating a problem with the mirror switch reference voltage. Specifically, it signifies a positive common open circuit in the mirror switch circuit. This means that the vehicle’s onboard diagnostic system has detected that the reference voltage for the mirror switch is not present, which can affect the operation of the power mirrors.

DTC B2346 symptoms

Common symptoms associated with DTC B2346 may include:

• Power mirrors not functioning
• Inability to adjust mirror positions
• Mirror switch may feel unresponsive
• Other electrical components in the vicinity may also exhibit issues

DTC B2346 causes

Several factors can lead to the occurrence of DTC B2346, including:

• Open circuit in the wiring harness
• Faulty mirror switch
• Corroded or damaged connectors
• Issues with the body control module (BCM)
• Short circuits or grounding issues

DTC B2346 seriousness

The seriousness of DTC B2346 can vary based on the vehicle’s use and the importance of the mirror functionality. While it may not prevent the vehicle from operating, it can compromise safety by limiting visibility. Therefore, it is advisable to address this issue promptly to ensure safe driving conditions.

How to diagnose DTC B2346

To diagnose DTC B2346, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the mirror switch and wiring for visible damage or disconnections.
3. Check the voltage at the mirror switch connector using a multimeter.
4. Test the continuity of the wiring harness between the mirror switch and the BCM.
5. Examine the BCM for any fault codes or issues.

How to fix DTC B2346 step-by-step instructions

To fix DTC B2346, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors related to the mirror switch.
3. Replace the mirror switch if it is found to be faulty.
4. Reconnect the wiring harness and ensure all connections are secure.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the mirror switch functionality to ensure proper operation.

How to erase DTC B2346

To erase DTC B2346, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner.
4. Select the option to clear or erase trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to check if the code reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.